宁波国际会展中心屋盖结构风振响应分析

发布时间：2018-01-16 03:20

本文关键词：宁波国际会展中心屋盖结构风振响应分析　出处：《华南理工大学》2010年硕士论文　论文类型：学位论文

【摘要】： 大跨度空间网架结构是工程中应用十分广泛结构形式,相对于索膜等柔性结构,该类结构的风振响应问题还没有引起足够重视。本文以宁波国际会展中心(二期)大跨度网架屋盖结构风振响应为研究对象,对该结构的风振响应进行了计算机模拟仿真分析。本文主要研究工作包括以下几方面: 1.本文以实际工程为算例,利用ANSYS命令流进行力学建模,考虑结构节点间的风速时程相关性,采用AR模型模拟节点随机脉动风速时程,使用自行编制的相关程序,进行了AR法和快速逆傅里叶变换(IFFT)的计算。计算结果表明该方法可有效地模拟具有时间相关性、空间相关性的节点脉动风速时程。得到的风速时程样本的功率谱密度与目标曲线吻合很好。另外还讨论了时间间隔和自回归阶数的取值对结构风荷载模拟的影响。 2.用ANSYS软件对结构进行自振特性分析,在上述工作的基础上计算了结构的风振响应,探讨了风速、竖向风、阻尼比、网架高度等基本参数变化对结构风振响应计算结果的影响。 3.根据算例分析结果指出现行规范设计方法对空间网架结构不适用之处,认为空间网架结构位移风振系数和内力风振系数不同,进而探讨了结构参数变化对位移风振系数和内力风振系数的影响,所得结果和结论为设计人员进行工程设计提供了参考。
[Abstract]:Large-span space truss structures are widely used in engineering. Compared with flexible structures such as cable and film, the problem of wind-induced vibration response of long-span space truss structures has not been paid enough attention to. In this paper, the wind-induced vibration response of large-span truss roof structure of Ningbo International Convention and Exhibition Center (second phase) is taken as the research object. The wind-induced vibration response of the structure is simulated and analyzed by computer. The main research work in this paper includes the following aspects: 1. Taking the actual engineering as an example, using the ANSYS command stream to model the mechanics, considering the correlation of wind speed between the structural nodes, the AR model is used to simulate the random pulsating wind speed time history of the nodes. The AR method and the Fast inverse Fourier transform (FFT) IFFTs are calculated by using the self-compiled program. The results show that the proposed method can be used to simulate the temporal correlation effectively. The power spectral density of the wind speed sample obtained is in good agreement with the target curve. In addition, the influence of the time interval and the autoregressive order on the wind load simulation of the structure is also discussed. . 2. The natural vibration characteristics of the structure are analyzed by ANSYS software. Based on the above work, the wind-induced vibration response of the structure is calculated, and the wind speed, vertical wind and damping ratio are discussed. The influence of the basic parameters such as the height of the grid structure on the calculation results of the wind-induced vibration response of the structure. 3. According to the result of example analysis, it is pointed out that the current code design method is not applicable to space grid structure, and it is considered that the displacement wind vibration coefficient and internal force wind vibration coefficient of space grid structure are different. Furthermore, the influence of structural parameters on the wind vibration coefficient of displacement and the wind vibration coefficient of internal force is discussed. The results and conclusions provided a reference for designers to carry out engineering design.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2010
【分类号】：TU312.1

【引证文献】